make private if not part of provider interface

providers/bitcoin/address.go

@@ -25,7 +25,7 @@ type Address struct {
 
 // GetAddress returns an Address struct populated with data from blockstream.info
 // for a given BTC address
-func (c *client) GetAddress(address string) (*Address, error) {
+func (c *client) getAddress(address string) (*Address, error) {
 	addressResponse := &Address{}
 
 	err := c.get(fmt.Sprintf("address/%s", address), addressResponse, url.Values{})